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{-# LANGUAGE CPP #-}
-- Copyright (c) 2005-2011 Stefan Wehr - http://www.stefanwehr.de
--
-- This library is free software; you can redistribute it and/or
-- modify it under the terms of the GNU Lesser General Public
-- License as published by the Free Software Foundation; either
-- version 2.1 of the License, or (at your option) any later version.
--
-- This library is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public
-- License along with this library; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
module UI.HSCurses.Logging (trace,debug) where
import Control.Monad.Trans
#ifdef __DEBUG__
import Data.IORef
import System.IO
import System.IO.Unsafe (unsafePerformIO)
import System.Locale
import System.Time
#endif
trace :: String -> a -> a
debug :: MonadIO m => String -> m ()
#ifdef __DEBUG__
logFile :: Handle
logFile = unsafePerformIO $ do h <- openFile ".hscurses.log" AppendMode
debug_ h "logging initialized"
return h
{-# NOINLINE logFile #-}
formatTime :: IO String
formatTime =
do let fmt = "%Y-%m-%d %H:%M:%S"
clockT <- getClockTime
calTime <- toCalendarTime clockT
let maxSdecLen = 5
sdec' = show $ ctPicosec calTime
sdec = if length sdec' > maxSdecLen
then take maxSdecLen sdec'
else sdec'
return (formatCalendarTime defaultTimeLocale fmt calTime
++ ":" ++ sdec)
trace s x =
unsafePerformIO $ do debug s
return x
debug s = liftIO $ debug_ logFile s
debug_ f s =
do ts <- formatTime
hPutStrLn f ("[" ++ ts ++ "] " ++ s)
hFlush f
#else
trace _ x = x
debug _ = return ()
#endif
|
